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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b288145f603975485bcbe0e255f50d1460b09d0232bd0001bd8148e6b12419e' 
  AND token = 'rhuseSQi1OGgrClN+9E7zLQ02s4Myupn+/g/3kinkKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}